GX214A (Gennum)
GX214A Monolithic 4x1 Video Multiplexer

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GX214A Monolithic 4x1
Video Multiplexer
DATA SHEET
FEATURES
low cost
differential gain at 3.58 MHz, 0.05% max.
differential phase at 3.58 MHz, 0.05 deg. max.
off-isolation better than 90 dB at 10 MHz
all hostile crosstalk at 3.58 MHz, 75 dB typ. (RIN= 75 )
make-before-break switching
FUNCTIONAL BLOCK DIAGRAM
IN 0 X
IN 1 X
IN 2 X
IN 3 X
OUTPUT
A0
A1
2 TO 4 DECODER
LOGIC
CHIP
SELECT
CS
TRUTH TABLE
CS A1 A0
00
0
00
1
01
0
01
1
1X
X
X = DON'T CARE
OUTPUT
IN 0
IN 1
IN 2
IN 3
HI - Z
ORDERING INFORMATION
Part Number
GX214 - ACDB
GX214 - ACKC
GX214 - ACKB
Package Type
14 Pin DIP
16 Pin SOIC
14 Pin SOIC
Temperature Range
0° to 70°C
0° to 70°C
0° to 70°C
CIRCUIT DESCRIPTION
The GX214A is a low cost 4x1 video multiplexer containing
four analog video switches and a 2 to 4 decoder. A Chip
Select input allows paralleled GX214As to be operated in
a switching matrix.
The GX214A represents a fully buffered, unilateral transmission
path when enabled. When disabled, the output is high
impedance.
The device operates from ± 7.5 V to ±9.5 V supplies with
TTL and 5 V CMOS compatible input logic levels.
APPLICATIONS
• CATV and CCTV systems
• low cost video routing
IN 0
SIG GND
IN 1
SIG GND
IN 2
SIG GND
IN 3
Pin 1
7
14
VCC
AO
A1
CS
OUT
LOGIC GND
8 VEE
PIN CONNECTION
14 PIN DIP
IN 0
SIG GND
IN 1
SIG GND
IN 2
SIG GND
IN 3
Pin 1
14
78
PIN CONNECTION
14 PIN SOIC
VCC
AO
A1
CS
OUT
LOGIC GND
VEE
IN 0
SIG GND
IN 1
SIG GND
IN 2
SIG GND
IN 3
NC
Pin 1
16
89
PIN CONNECTION
16 PIN SOIC
VCC
NC
AO
A1
CS
OUT
LOGIC GND
VEE
Document No. 520 - 5 - 1
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946
Japan Branch: A-302 Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168, Japan tel. (03) 3334-7700 fax: (03) 3247-8839


GX214A (Gennum)
GX214A Monolithic 4x1 Video Multiplexer

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Parameter
ABSOLUTE MAXIMUM RATINGS
Value
Parameter
Value
Supply Voltage
Operating Temperature Range
Storage Temperature Range
± 10.0 V
0 °C TA 70 °C
-65 °C TS 150 °C
Lead Temperature (Soldering, 10 Sec)
260 °C
Analog Input Voltage
Logic Input Voltage
-4 V VIN VCC+0.3 V
0 V VL 5.5 V
NOTE: A short from output to ground or either supply will destroy the device.
For REXT use a 2.67 k1%, 1/4 W resistor.
ELECTRICAL CHARACTERISTICS VS = ± 8 V DC, 0°C < TA < 70 °C, RL = 2.67 kto VEE, CL = 30pF IL = 3mA
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC
SUPPLY
STATIC
Supply Voltage
Supply Current
not including IL
Analog Output
Voltage Swing
Analog Input Bias
Current
Output Offset Voltage
Turn-On Time
Turn-Off Time
LOGIC
Logic Input
Thresholds
Logic Input
Bias Current
Insertion Loss
DYNAMIC
Bandwidth (-3dB)
Input Resistance
Input Capacitance
Output Resistance
Output Capacitance
Differential Gain
Differential Phase
All Hostile Crosstalk
Chip Disabled Crosstalk
±VS
I+
I-
VOUT
IIN
VOS
tON
tOFF
VIH
VIL
IBIAS
I.L.
B.W.
R IN
CIN
R OUT
COUT
dg
dp
XTALK(AH)
XTALK(CD)
Chip selected (CS=0)
Chip not selected (CS=1)
Chip selected (CS=0)
Chip not selected (CS=1)
Extremes before
clipping occurs
75resistor on each
input to ground
Control input to appearance
of signal at output.
Control input to disappear-
ance of signal at output.
1
0
Chip Selected A0,A1 = 1
Chip Selected A0,A1 = 0
1V p-p sine or sq. wave
at 100 kHz
Chip selected (CS = 0)
Chip selected (CS = 0)
Chip not selected (CS=1)
Chip selected (CS=0)
Chip not selected (CS=1)
at 3.58 MHz
VIN = 40 IRE
Sweep on 3 inputs 1V p-p
4th input has 75 resistor
to gnd. ƒ = 10 MHz
One xpt on output to ground
ƒ = 10 MHz
7.5
-
-
-
-
-
-
+5
-
500
2.4
-
-
-
0.05
65
900
-
-
-
-
-
-
72
90
8.0
14
0.5
13
0.58
-
25
-30
250
750
-
-
-
-
0.08
85
-
2.0
2.2
14
12
-
-
75
100
9.5
20
0.85
18
0.88
+5.0
-1.2
-
V
mA
mA
mA
mA
V
µA
-70 mV
400 ns
- ns
-
0.6
1
2
0.11
V
V
nA
µA
dB
-
-
-
-
-
-
0.05
0.05
-
-
MHz
k
pF
pF
pF
%
deg.
dB
dB
520 - 5 - 1
2


GX214A (Gennum)
GX214A Monolithic 4x1 Video Multiplexer

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APPLICATION INFORMATION
The circuit layout of any wideband circuit is critical. Good
high frequency design practice, proper lead dress and
PCB component placement along with a well regulated and
decoupled power supply will assure optimum performance
of the crosspoint.
The GX214A is non-inverting. The inputs are buffered and
require 75line terminating resistors when driven from 75
cable. The inputs may be driven directly from an amplifier
which has low output impedance.
The output of the GX214A must be buffered to drive 7
lines. The addition of an amplifier/buffer also allows adjustments
to be made to the gain, offset and frequency response of
the circuit.
An external load current of 2 to 8mA should be supplied
from each output bus to negative supply. For most applications
a load resistor of 2.67k, 1% is recommended to minimize
offset drift with temperature. In order to improve differential
phase and tighten the insertion loss tolerance, an external
constant current active load may be substituted for the
load resistor. Note however, that since only one GX214A
output drives the output bus at any one time, only one
external load is needed for the bus.
A typical application is shown below. Two GX214A ICs are
paralleled to form an 8x1 crosspoint matrix. The three
address lines make use of the A0, A1 and CS inputs. If more
than two devices are used in parallel, a decoder is necessary
in order to generate the extra address inputs.
Signal Ground (SG) pins 2, 4 and 6 must be joined together
and preferably form part of a ground plane. The Signal
Ground must also be connected to the ±8V power supply
ground. The potential of the Logic Ground (LG) pin 9 can
deviate from the Signal Ground by ±0.5V maximum. Alternatively,
the signal and logic grounds can be joined together at one
point only.
Depending on the application and the speed of the logic
family used, latches may be required for synchronization
where timing delays are critical. The active switching
circuitry of the GX214A ensures low crosstalk and high per-
formance over an input voltage range of -1.2 to +5.0 volts.
INPUTS
V0
V1
V2
V3
75
75 75 75
VIDEO SWITCHES
0.1 +8V
1 IN 0
2 SG
3 IN 1
4 SG
5
IN 2
6 SG
7
IN 3
+V 14
13
A0
A 1 12
CS 11
10
OUT
9
LG
-V 8
0.1
-8V
+8V
0.1
A0
A 1 ADDRESS
A2
V4
V5
V6
V7
75 75
75 75
1 IN 0
2 SG
3 IN 1
4 SG
5 IN 2
6 SG
7 IN 3
+V 14
A 0 13
A 1 12
11
CS
OUT 10
9
LG
-V 8
0.1
-8V
2.67 K
GAIN, OFFSET, FREQUENCY
RESPONSE ADJUSTMENTS
75
AMPLIFIER/BUFFER
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
V OUT
Fig. 1 8x1 Video Multiplexer Incorporating Two GX214A Devices
3 520 - 5 - 1


GX214A (Gennum)
GX214A Monolithic 4x1 Video Multiplexer

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TYPICAL PERFORMANCE CURVES FOR GX214A
VS = ± 8V, CL = 30pF, IL = 3mA unless otherwise shown
5 0.0
4 -0.5
3 -1.0
2 -1.5
1 -2.0
0 -2.5
-1 -3.0
-2 -3.5
-3 -4.0
-4 -4.5
-5 11
10 110000
FREQUENCY (MHz)
Fig. 2 Gain vs Frequency
-5.0 11
35
FREQUENCY (MHz)
Fig. 3 Phase vs Frequency
1100
-20
-30
-40
-50
XTALK (AH)
-60 RS=75
-70
-80
IN 1,2
-90
-100
IN 0,3
OFF ISOLATION
RL=15
-110
-120
1
10
FREQUENCY (MHz)
100
Fig. 4 All - Hostile Crosstalk & Off-Isolation vs Frequency
0.05
0.04
0.03 VIN=40 IRE
0.02
0.01
dg
0.00
-0.01
-0.02
-0.03
-0.04
dp
-0.05
11
35
1100
FREQUENCY (MHz)
Fig. 5 Differential Gain & Phasevs Frequency
+5V
FROM
NETWORK
ANALYSER
75
1 IN0
2 AG
13
A0
A1 12
CS 11
OUT 10
LG 9
VCC VEE
0.1
1
4 CLC110 8
2.67k
5
TO
NETWORK
ANALYSER
14 8
+8V
-8V 0.1
-5V
**
* The power supply pins should be suitably decoupled with at least 0.1µF, high quality capacitors
All resistors in ohms, all capacitors in microfarads unless otherwise stated.
Fig. 6 Test Circuit
The TEST SET UP shown is for INPUT 0 tests. Similar circuitry is used for each input INPUT in order to test
FREQUENCY RESPONSE and PHASE DELAY. For OFF-ISOLATION, all switches are disabled (CHIP SELECT
= logic 1) and a second enabled GX214A is connected to the output bus. For ALL-HOSTILE CROSSTALK,
three OFF switches are driven from the generator and the fourth is terminated with a 75resistor. For the
DIFFERENTIAL GAIN and PHASE tests, the output is AC coupled to the output amplifier and the input level
from the generator is modulated with a step signal varying between 0 volts DC and 0.714 volts DC.
520 - 5 - 1
4


GX214A (Gennum)
GX214A Monolithic 4x1 Video Multiplexer

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CAUTION
ELECTROSTATIC
SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE
EXCEPT AT A STATIC-FREE WORKSTATION
REVISION NOTES .
Block diagram added,new test circuit, revised electrical
characteristics, new application circuit, all new response graphs.
DOCUMENT
IDENTIFICATION
PRODUCT PROPOSAL
This data has been compiled for market investigation purposes
only, and does not constitute an offer for sale.
ADVANCE INFORMATION NOTE
This product is in development phase and specifications are
subject to change without notice. Gennum reserves the right to
remove the product at any time. Listing the product does not
constitute an offer for sale.
PRELIMINARY DATA SHEET
The product is in a preproduction phase and specifications are
subject to change without notice.
DATA SHEET
The product is in production. Gennum reserves the right to make
changes at any time to improve reliability, function or design, in
order to provide the best product possible.
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
© Copyright July 1990 Gennum Corporation. Revision Date: February 1993. All rights reserved.
5
Printed in Canada.
520 - 5 - 1




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